package com.itheima.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * @author slstart
 * @create 2021-05-23 19:28
 */
//@WebFilter(urlPatterns = "/contact/*",dispatcherTypes = {DispatcherType.FORWARD,DispatcherType.REQUEST})
public class ContactFilter implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        HttpSession session = request.getSession();
        Object user = session.getAttribute("user");
        if(user==null){
            String uri = request.getRequestURI();
            String method = request.getParameter("method");
            String oldUri = uri+"?method="+method;
            session.setAttribute("oldUri",oldUri);
            request.getRequestDispatcher("/user?method=login").forward(request,response);
            return;
        }

        chain.doFilter(request, response);
    }

    public void init(FilterConfig config) throws ServletException {

    }

}
